Improvement in dental drills



UNITED STATES PAT NT .OFFIoE.

ANDERSON W. TODD, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN DENTAL DRILLS.

Specification forming part of Letters Patent No. 176.710, dated April25, 1876; application filed May 3, 1875.

v To all whom it may concern Be it'known that I, ANDERSON W. TODD,

, of the city of Chicago, county of Cook, and

State of Illinois, have invented a new and improved machine for drillingoutand forming the cavities in teeth preparatory to filling or pluggingthem, fordressin g off the plugs, and other valuable purposes; and I dohereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawings,and

.to the letters of reference marked thereon, making part of thisspecification, in which- M N VL O R Y'P, Figures 2 and 3, represent ametal tube-handle device. It is constructed by means of a section ofmetal pipe about five inches long and half an inch external diameter,one end of which is first. annealed, and

' then one inch of it is flattened to a quarter of an inch diameterthrough the flat way, and

this flat part is slotted down half an inch, and

of an inch long, and are tapered very lightly from their middle, so asto catch fast in the grooved pulley only. The holes in the heads becomethe bearings for the shaft-drills O. In this case the drill serves thedouble purpose of shaft for grooved wheel and of drilLbit. To remove thedrill, press its head againstany hard substance, by which means anynumber of exchanges can be made. The other end of the handle M has thefunnel P soldered in it, the

. object being to enable the cord-belt to glide smoothly, and withoutchafing, from all the directions it must necessarily come in the variousoperations.

The round bar V is soldered across the top of the funnel in thesamedirection as that of the shaft-bit. The objectof the round bar is tokeep the cord-belt from crossing inside the handle. The cord-belt isabout No. 16 wire gage, and its ends are passed one on each side of thegrooved pulley through the openings provided between the ends of thesides of the slot, and out (properly leaving the round bar between them)through the handle. The ends are then united. The string loop Y, or somesuitable arrangement, may be attached to the handle M, so as to giveassistance in holding and pushing it. The handle is held in the fingersmuchv like that of a pen in writing, and, in dextrous hands, the drillmay be applied to almost any point in the teeth.

The device or apparatus A B G D E F G, Fig. l,has forked feet U, whichare rounded out, so as to spring over and be retained on the shaft orcollar of the lathe-head A. Thereby a connection is formed between them,affording a back and forward motion, and the belt between the head ofthe lathe and pulley G forms another connection, whereby motion is givento thepulley E. Being thus arranged and con-' nected by the putting ofbelt L in communication with the pulley E, full connection is madebetween the apparatus and lathe, as shown in the drawings.

Having shown my invention by drawings and described it byspecification,what I claim, and desire Letters Patent for of the UnitedStates is 1. In a dental drill, the combination of the tube-handle M,cross-bar V, cord L, pulley N, journaled by the tool 0, all as and forthe purpose specified.

2. The combination, with the lathe-head A and its shaft B, of theslotted feet G, section D, pulleys G E, foot F, and section D, Fig. 4,all as and for the purposes set forth.

A. W. TODD. Witnesses:

SAMUEL STERNBERGER, L. BAOHE.

